How to Find Substack Newsletters to Sponsor, Using Real Subscriber Counts

Newsletter sponsorships remain effective because readers tend to pay attention to the ads they see there. Advertisers should look for newsletters that match their customers, are still actively publishing, and fit their budget, with subscriber counts often in the 2,000 to 50,000 range. Manually searching Substack and checking each newsletter's activity and contact details is slow, so the author describes a paid tool that compiles subscriber counts, posting frequency, and author contact links into one table. Before buying, advertisers are advised to read recent issues to confirm writing quality and reader engagement, and to start with a few newsletters while tracking signups per placement. Newsletter owners can also pursue free cross-promotions with peers of similar size.